Temboard-Agent Bug on Ubuntu 22.04

[shiroikosuke]

Hello, i have issued with this log when i started the temboard-agent service

INFO: app: Using config file /etc/temboard-agent/15/main/temboard-agent.conf.
INFO: fetch_key: Requesting public key from https://temboard-testserver.com:8888.
ERROR: app: Unhandled error:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/temboardagent/toolkit/app.py", line 351, in entrypoint
retcode = self.main(argv, environ)
File "/usr/lib/python3/dist-packages/temboardagent/cli/app.py", line 135, in main
return command.main(args)
File "/usr/lib/python3/dist-packages/temboardagent/cli/fetch_key.py", line 41, in main
response = ui_client.get('/signing.key')
File "/usr/lib/python3/dist-packages/temboardagent/toolkit/http.py", line 148, in get
return self.request('GET', path, headers)
File "/usr/lib/python3/dist-packages/temboardagent/toolkit/http.py", line 128, in request
conn.request(method, path, body, headers)
File "/usr/lib/python3.10/http/client.py", line 1283, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/lib/python3.10/http/client.py", line 1329, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/lib/python3.10/http/client.py", line 1278, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/lib/python3.10/http/client.py", line 1038, in _send_output
self.send(msg)
File "/usr/lib/python3.10/http/client.py", line 976, in send
self.connect()
File "/usr/lib/python3.10/http/client.py", line 1448, in connect
super().connect()
File "/usr/lib/python3.10/http/client.py", line 942, in connect
self.sock = self._create_connection(
File "/usr/lib/python3.10/socket.py", line 824, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
File "/usr/lib/python3.10/socket.py", line 955, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
ERROR: app: temboardagent version is 8.2.1.
ERROR: app: This is a bug!

Do you have solution for this bug ? when i trace the bug, the bug is comes from the python folder.

If anyone can help this, i really appreciate and thankyou !